Centralized WLAN STA Switching via CAPWAP Control Messages
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Solution Overview
Problem
Existing methods for switching a station (STA) in a Wireless Local Area Network (WLAN) based on the WLAN Authentication and Privacy Infrastructure (WAPI) protocol are not applicable to centralized WLAN architectures, where authentication and policy enforcement are managed centrally by an access controller.
Innovation Solution
A method and system for switching an STA between Wireless Terminal Points (WTPs) under the same access controller (AC) when a WLAN Privacy Infrastructure (WPI) is performed by the AC, involving re-association, deletion, and addition of the STA through CAPWAP control messages, ensuring secure and rapid switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing STA switching method is applied in centralized WLAN architecture, then the method can be used, but it cannot be directly applicable because the autonomous architecture method is designed for different control mechanisms
Solution Approach 1:
The patent introduces CAPWAP control messages as an intermediary mechanism between the access controller and wireless terminal points. These messages serve as a standardized interface that enables the access controller to manage STA switching operations across multiple WTPs in a centralized architecture, resolving the incompatibility between autonomous architecture methods and centralized control requirements.
Solution Approach 2:
The patent extends the STA switching method to work universally across both autonomous and centralized WLAN architectures by using CAPWAP control messages. This allows the same basic switching functionality to be implemented in different architectural contexts, improving adaptability while managing complexity through a unified control approach.
2Reliability
If the access controller performs WPI management centrally, then authentication and policy enforcement are improved, but the complexity of centralized control increases
Solution Approach 1:
The patent segments the WPI management function by introducing CAPWAP control messages that separate the control plane (access controller) from the data plane (wireless terminal points). This segmentation allows centralized authentication and policy enforcement while reducing the complexity burden on the access controller through standardized, modular control interfaces.
3Productivity
If STA switching is implemented in centralized WLAN, then rapid and secure switching is achieved, but the control message processing complexity increases
Solution Approach 1:
The patent replaces complex manual STA switching operations with automated CAPWAP control message processing. This substitution enables rapid STA switching between WTPs while managing processing complexity through standardized message formats and automated control logic, improving productivity without proportionally increasing operational complexity.
Data Source
AI summary
The embodiment of the present invention relates to a method and a system for switching station in centralized wireless local area network (WLAN) when the WLAN privacy infrastructure (WPI) is performed by an access controller (AC). The method includes: step 1: the station re-associates with the AC through the destination wireless terminal point (WTP); step 2: the AC informs the associated WTP to delete the station; step 3: the AC informs the destination WTP to join the station. The invention implements the operation of joining station and deleting station between the AC and the WTP based on the control and provisioning of wireless access points protocol (CAPWAP) control message during the process of switching station. Therefore, the invention can quickly and safely implement the station switching among the WTPs under the same AC.